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step-1. With B as center and any convenient radius draw an arc intersecting AB at L.
Step - 2 With L as center and radius LB draw an arc intersecting the arc drawn in step 1 at M.
Step-3 With M as center and radius LB draw an arc intersecting the arc drawn in step 1 at N. { on the same side as M]
Step 4. With M and N as centers and any convenient radius draw arcs intersecting each other at C.
Step 4. Joint BC it will be perpendicular to AB